Low noise preamplifier circuit composed of OPA37

The input signal is added to the in-phase input terminal (pin 3) of OPA37. RL and CL in the circuit are the load impedance of the electromagnetic pickup. Its resistance and capacitance can be determined according to the characteristics of the pickup (generally selected according to the parameters recommended by the pickup manufacturer). All resistors in the figure should be metal film resistors (accuracy is 1%), and their capacitors should be organic film capacitors.